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CaseSingularPlural
Nominativeименительный · кто? что?весёлый весёлые the subject: who or what acts
Accusativeвинительный · кого? что?весёлый (inanimate) / весёлого (animate) весёлые (inanimate) / весёлых (animate) the direct object of the verb
Genitiveродительный · кого? чего?весёлого весёлых possession, absence, "of"-phrases
Dativeдательный · кому? чему?весёлому весёлым the receiver: to or for someone
Instrumentalтворительный · кем? чем?весёлым весёлыми the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?весёлом весёлых location and topics: in, at, about

Весёлый is an adjective: it copies the gender, number, and case of its noun. The table shows masculine and plural; feminine and neuter follow the same stem with their own endings.

Look up any other word in the Russian declension tool, see where весёлый ranks in the most common Russian words, or start from Russian cases explained if the table above is new territory. More vocabulary lives in Russian words by topic and Russian phrases.

12 forms is a table. Using them is a skill.

Slova drills весёлый and every word like it with typed case endings, checked letter by letter.

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